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Gallium3D UBO/TBO Support Emerges - More GL 3.x

Mesa

Published on 06 December 2012 09:29 AM EST
Written by Michael Larabel in Mesa
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In addition to pushing OpenGL transform feedback for Gallium3D's LLVMpipe, David Airlie has released a new patch-set for Uniform Buffer Objects (UBOs) and Texture Buffer Objects (TBOs) within Mesa's Gallium3D infrastructure.

In the early hours of this morning, Airlie released a set of six patches under a "request for comments" state that implements UBO and TBO support. While the work touches some common Gallium3D code like the Mesa state tracker, right now the newly enabled-features are only properly working for Softpipe -- the slow Gallium3D software rasterizer that's a reference driver implementation and even slower than LLVMpipe.

Beyond the Softpipe support, Airlie has written an "initial hack" for TBO support within the R600 Gallium3D driver but hasn't yet attempted Uniform Buffer Objects on this Radeon Gallium3D driver nor Nouveau. Texture Buffer Objects were added to the core specification with OpenGL 3.0 and is a 1D texture backed by a buffer object. Uniform Buffer Objects are buffer objects storing uniform data and have been part of the specification since OpenGL 3.1.

With the newly-enabled support, the Gallium3D Softpipe driver has also been adjusted to advertise GLSL 1.40 compliance. Version 1.40 of the GL Shading Language is the version to match OpenGL 3.1.

Uniform Buffer Object support within Mesa itself has been worked on for over one year and revised since that point.

About The Author
Michael Larabel is the principal author of Phoronix.com and founded the web-site in 2004 with a focus on enriching the Linux hardware experience and being the largest web-site devoted to Linux hardware reviews, particularly for products relevant to Linux gamers and enthusiasts but also commonly reviewing servers/workstations and embedded Linux devices. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics hardware drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated testing software. He can be followed via and or contacted via .
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